Hi, On Sat, Jan 06, 2018 at 04:10:38AM +0200, Aaro Koskinen wrote: > On Fri, Jan 05, 2018 at 04:00:25PM -0800, Linus Torvalds wrote: > > On Fri, Jan 5, 2018 at 2:04 PM, Aaro Koskinen <aaro.koski...@iki.fi> wrote: > > > After v4.14, I've been unable to boot my AMD compilation box with the > > > v4.15-rc mainline Linux. It just ends up in a silent reboot loop. > > > > > > I bisected this to: > > > > > > commit fa564ad9636651fd11ec2c79c48dee844066f73a > > > Author: Christian König <christian.koe...@amd.com> > > > Date: Tue Oct 24 14:40:29 2017 -0500 > > > > > > x86/PCI: Enable a 64bit BAR on AMD Family 15h (Models 00-1f, 30-3f, > > > 60-7f) > > > > Hmm. That was reported to break boot earlier already. > > > > The breakage was supposedly fixed by three patches from Christian: > > > > a19e2696135e: "x86/PCI: Only enable a 64bit BAR on single-socket AMD > > Family 15h" > > > > 470195f82e4e: "x86/PCI: Fix infinite loop in search for 64bit BAR > > placement" > > > > and a third one that was apparently never applied. > > > > I'm not sure why that third patch was never applied, I'm including it here. > > > > Does the system work for you if you apply that patch (instead of > > reverting all of them)? > > Yes, I think it now works. > > When booting with kexec from v4.14: > 89876f275e8d562912d9c238cd888b52065cf25c alone ==> boot fails. > 89876f275e8d562912d9c238cd888b52065cf25c and the patch ==> boot OK.
I also re-tested with normal reboot/reset and BIOS boot (just to eliminate any kexec side-effects), and the results are the same. The patch "x86/PCI: limit the size of the 64bit BAR to 256GB" is fixing the boot on my system. A.
